High Precision Reversing Cold Rolling Mill for Carbon and Stainless Steel - China Suppliers & Factory
The Theory of Four Roll Rolling Mill
The four roll rolling mill system is composed of two support rolls and two working rolls, working in coordinated action to reduce material thickness and extend material length to meet expected specifications.
During milling, the pressing cylinder or mechanical pressing device transmits pressing force to the support roll bearing stand, then to the support roll, working roll, and finally to the rolled piece. The workpiece height is reduced (becomes thinner) and length is extended (becomes longer), meeting the expected specifications.
Due to the impact of pressing force, rollers will become bent and the workpiece edges will become thinner. Therefore, rollers require grinding for convexity adjustment according to the practical situation.
Product Introduction
The four-high reversing cold rolling mill is a key metal pressure processing equipment, widely used in metallurgy, mechanical manufacturing, and non-ferrous metal processing industries to achieve material thinning, surface quality improvement, and mechanical property enhancement.
From a technical perspective, the four-high reversing cold rolling mill consists of work rolls and backup rolls. The work rolls directly contact the rolled piece to perform rolling deformation, while the backup rolls support the work rolls to reduce their deflection and ensure the stability and accuracy of the rolling process. The reversible design enables the rolling mill to roll in both forward and reverse directions without frequent adjustments, significantly improving production efficiency.
Application Scope: Suitable for rolling stainless steel, carbon steel, alloy steel, copper, and aluminum strips and plates — meeting strict industry requirements for thickness, width, surface quality, and mechanical properties.
In the automotive manufacturing industry, rolled plates are used for body panels requiring high strength, good formability, and corrosion resistance. In the electronic and electrical industry, rolled strips are used for precision components requiring high surface finish and dimensional accuracy.
In terms of industry standards, the design, manufacture, and acceptance of four-high reversing cold rolling mills follow strict standards covering structure, performance, safety, and environmental protection — ensuring stable and reliable operation and operator safety. Parameters such as rolling force, rolling speed, and roll diameter are clearly specified to guarantee process consistency and rolling quality.
Operation and maintenance are also critical. Operators require professional training to be familiar with the rolling mill's structure and operating procedures. Regular maintenance — including roll replacement, lubrication system inspection, and electrical system maintenance — is essential to ensure long-term stable operation.
Technical Parameter Table
| MILL MODEL / TECHNICAL PARAMETER | 650 | 750 | 850 |
| Material | Carbon steel and low alloy steel | Carbon steel and low alloy steel | Carbon steel and low alloy steel |
| Material thickness (mm) | 2.0~3.0 | 2.0~3.0 | 2.0~3.5 |
| Material width (mm) | 400~550 | 500~650 | 600~750 |
| Finish thickness (mm) | 0.5~0.15 | 0.5~0.16 | 0.5~0.18 |
| Pressing force (KN) | 5000 | 6000 | 7500 |
| Support roll Specification (mm) | Φ550×600 | ¢650×700 | ¢700×820 |
| Middle roll Specification (mm) | ———— | ———— | Φ300/Φ280×820 |
| Working roll Specification (mm) | Φ185/Φ165×650 | ¢205/Φ190×750 | Φ225/Φ205×850 |
| Driving method | Working roll driving | Working roll driving | Working roll driving |
| Main motor | DC motor | DC motor | DC motor |
| Speed reducer | Joint gear box | Joint gear box | Joint gear box |
| Uncoiler (specifications) | ¢610×650 | ¢610×750 | ¢610×850 |
| Recoiler (specifications) | ¢508×650 | ¢508×750 | ¢508×850 |
| Rolling speed (m/min) | 360 | 450 | 540 |
| Uncoiler tension (KN) | 30 | 35 | 45 |
| Recoiler tension (KN) | 10~70 | 10~80 | 10~90 |
| Pressing method | Hydraulic AGC | Hydraulic AGC | Hydraulic AGC |
| DC speed regulator | Siemens 6RA70 | Siemens 6RA70 | Siemens 6RA70 |
| Electric control | Siemens PLC | Siemens PLC | Siemens PLC |
⚠️ Remark: The model and parameters shown in this table are for reference only. Design and production can be tailor-made according to user's requirements.